TY - JOUR A1 - Hofmann, Michael A1 - Richter, Matthias A1 - Jann, Oliver T1 - Use of commercial radon monitors for low level radon measurements in dynamically operated VOC emission test chambers T2 - Radiation Protection Dosimetry N2 - Compared to the intended EU reference level of 300 Bq m−3 for indoor radon concentrations, the contribution of building materials appears to be low. Considering the recommended limit of 100 Bq m−3 by WHO, their contribution is supposed to be relevant, especially at low air exchange rates. This study as part of a two-part research project investigated the suitability of direct low level 222Rn measurement under simulated indoor conditions with commercial radon monitors and dynamically operated emission test chambers. Active measuring devices based on ionisation or scintillation chambers with 1-σ uncertainties below 8.6% at 20 Bq m−3 were found to be best suitable for a practical test procedure for the determination of radon exhalation rates of building materials. For the measurement of such low concentrations, the knowledge of the accurate device background level is essential. PB - Oxford Academic KW - Radon monitors KW - Radon exhalation KW - Building materials KW - Measurement method PY - 2017 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/41952 AN - OPUS4-41952 SN - 1742-3406 SN - 0144-8420 VL - 177 IS - 1-2 SP - 16 EP - 20 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany